In passing, we note that we do not detect the radio halo of A2065 in our current \(\approx 8^{\prime \prime }\)  resolution 250–500 MHz band image. This is likely to be due to the fairly short duration of our observing run (just \(\approx 1.3\)  hr), which results in poor (\(u,v\) )-coverage at the short spacings that are critical to detect \(\approx 10^\prime \) -sized structures like the radio halo [1]}. However, the large fractional bandwidth at 250–500 MHz band implies that it has excellent (\(u,v\) )-coverage at the intermediate and long baselines that are needed to accurately map the arcminute-sized structures like our target, the remnant radio galaxy (angular size \(\approx 1^\prime \times 2^\prime \) ).
In addition, we have performed deep clean, where we have used the multiscale multifrequency synthesis process of combining data from multiple spectral channels onto the same spatial-frequency grid during imaging to take advantage of the increased (\(u,v\) )-coverage and imaging sensitivity, and hence we do not foresee any loss of flux density that could be linked to the remnant radio galaxy in the data presented above.
Below we discuss the nature of this newly discovered remnant radio galaxy in A2065.
